Update spam circle cache after updating circle status.

JSMR.Infrastructure/Caching/SpamCircleCache.cs

@@ -0,0 +1,23 @@
+using JSMR.Application.Common.Caching;
+using JSMR.Infrastructure.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace JSMR.Infrastructure.Caching;
+
+public class SpamCircleCache(IDbContextFactory<AppDbContext> contextFactory, ICache cache)
+    : CacheObject<string[]>(cache), ISpamCircleCache
+{
+    protected override string Key => "SpamCircles";
+
+    protected override async Task<string[]> FetchAsync(CancellationToken cancellationToken = default)
+    {
+        using var context = contextFactory.CreateDbContext();
+
+        return await context.Circles
+            .AsNoTracking()
+            .Where(circle => circle.Spam)
+            .Select(circle => circle.MakerId)
+            .Distinct()
+            .ToArrayAsync(cancellationToken);
+    }
+}